| Cannabis Information on marijuana, how it is taken, and effects it has on the body. |
| Cognitive Deficits Associated With Heavy Marijuana Use Appear To Be Reversible Report in 2002 about a study showing that memory and learning problems caused by heavy marijuana smoking persist for at least a week after cessation of use of the drug, but they appear to resolve completely within a month. The study was supported by the National Institute on Drug Abuse. |